Cyrus Petrillo is a minor character in the series. He is portrayed by Jake Weary.

An old friend of Alison DiLaurentis from her missing years, Cyrus is arrested as her kidnapper. We learn that this is an actually an elaborate ruse from Alison and Cyrus, and Cyrus leaves town. However, Cyrus soon becomes more wrapped up in the "Game" when he begins working for "A".